Adds BinaryQuestion component

[jonnyspicer]

Pull Request: Adds BinaryQuestion component

Notes

I'd still like to refactor the BinaryQuestion component more, and will likely do this as part of creating the MCQ component by pulling out any code fragments that can be shared between the two. The next step will be to create a QuestionTypeSelection component and a MultipleChoiceQuestion component. With the URL constant, over time it'd be good to try to move all hardcoded values to constants (particularly strings). Rather than spending a lot of time refactoring now, I'll aim to make these changes whenever I'm touching that part of the codebase anyway.

Changes Made

• There should be no changes in behaviour as a result of this PR
• Adds a new BinaryQuestion component, taken from the existing Predict component
• Adds a new generic QuestionTypeProps interface
• Refactors the Predict component to import the BinaryQuestion component
• Adds a new fatebook_url constant

Testing

Tested locally and on preview deployment, I seem to be able to create and resolve questions fine on both.

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[adam-binks]

Lgtm!